AS1320 AMSCO, AS1320 Datasheet

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AS1320

Manufacturer Part Number
AS1320
Description
Step-Up DC-DC Converter
Manufacturer
AMSCO
Datasheet
www.DataSheet4U.com
A S 1 3 2 0
2 0 0 m A St e p - U p D C - D C C o n v e r t e r
1 General Description
The AS1320 is a high-efficiency step-up DC-DC con-
verter designed to generate a fixed voltage of +3.3V.
The AS1320 achieves an efficiency of up to 90%. The
minimum input voltage is 1.5V, the output voltage is
fixed at 3.3V, and output current is up to 200mA (@ 2V).
In order to save power the AS1320 features a shutdown
mode, where it draws less than 1µA. In shutdown mode
the battery is connected directly to the output enabling
the supply of real-time-clocks.
The AS1320 provides a power-on reset output that goes
high-impedance when the output reaches 90% of its reg-
ulation point.
The SHDNN trip threshold of the AS1320 can be used
as an input voltage detector that disables the device
when the battery voltage falls to a predetermined level.
An internal synchronous rectifier is included, thus an
external transistor or Schottky diode is not required.
The AS1320 is available in a 6-pin SOT23 package.
Figure 1. Application Diagram
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+1.5 to +3.5V
Battery
22µF
C
IN
On
Off
10µH
L1
SHDNN
BATT
LX
2
4
1
Revision 1.02
AS1320
2 Key Features
3 Applications
The AS1320 is ideal for low-power applications where
ultra-small size is critical as in medical diagnostic equip-
ment, hand-held instruments, pagers, digital cameras,
remote wireless transmitters, cordless phones, and PC
cards.
The device is also perfect as a local 3.3V supply or as a
battery backup.
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Fixed Output Voltage: 3.3V
Output Current: Up to 200mA (@ 2V)
Internal Synchronous Rectifier
Requires No External Schottky Diode or FETs
Shutdown Mode Supply Current: Less Than 1µA
Efficiency: Up to 90%
Minimum Input Voltage: +1.5V
Accurate Shutdown Low-Battery Cutoff Threshold
Battery Input Connected to Pin OUT in Shutdown
6-pin SOT23 Package
Mode for Backup Power
a us t ria
6
RESETN
3
GND
5
OUT
C
22µF
OUT
m i c r o
100kΩ
R
1
Output
+3.3V
RESETN
Output
s y s t e m s
D a t a S h e e t
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Related parts for AS1320

AS1320 Summary of contents

Page 1

... The AS1320 achieves an efficiency 90%. The minimum input voltage is 1.5V, the output voltage is fixed at 3.3V, and output current 200mA (@ 2V). In order to save power the AS1320 features a shutdown mode, where it draws less than 1µA. In shutdown mode the battery is connected directly to the output enabling the supply of real-time-clocks ...

Page 2

AS132 0 Data Sheet 4 Absolute Maximum Ratings Stresses beyond those listed in Table 1 and functional operation of the device at these or any other conditions beyond those indicated in Characteristics on page 3 is not implied. Exposure to ...

Page 3

AS132 0 Data Sheet 5 Electrical Characteristics T = -40 to +85º +2V, V AMB BATT OUT Table 2. Electrical Characteristics Parameter Battery Input Range 1 Startup Battery Input Voltage 2 Output Voltage N-Channel On-Resistance P-Channel On-Resistance 1 ...

Page 4

AS132 0 Data Sheet 6 Typical Operating Characteristics V = 3.3V +2V +25ºC. OUT BATT AMB Figure On, 16Ω OUT BATT Battery ...

Page 5

AS132 0 Data Sheet Figure 8. Line Transient 100µs/Div Figure 10. On/Off Response 33Ω LOAD 100µs/Div Figure 12. Switching Waveforms; R LOAD 10µs/Div www.austriamicrosystems.com Figure 9. Load Transient 200mA Figure 11. Shutdown Response 33Ω Figure 13. ...

Page 6

... Shutdown When pin SHDNN is low the AS1320 is switched off and no current is drawn from battery; when pin SHDNN is high the device is switched on. If SHDNN is driven from a logic-level output, the logic high-level (on) should be referenced avoid intermittently switching the device on ...

Page 7

... AS132 0 Data Sheet Low-Battery Cutoff The AS1320 SHDNN trip threshold (1.228V) can be used as an input voltage detector that disables the device when the battery input voltage falls to a pre-set level. An external resistor-divider network can be used to set the battery- detection voltage (see Figure 15) ...

Page 8

... Application Information Inductor Selection The control circuitry of the AS1320 permits a wide range of inductor values to be selected – from 4.7 to 47µH; 10µH is ideal for most applications. The intended application should dictate the value of L. The trade-off between required PCB surface area and desired output ripple are the determining factors: smaller values for L require less PCB space, larger values of L reduce output ripple ...

Page 9

... BATT 2 5 OUT GND Description Active-Low Logic Shutdown Input 0 = The AS1320 is off and the current into BATT is ≤ 1µA (typ The AS1320 is on. Battery Voltage Input Ground External Inductor Connection Output Voltage Active-Low reset output Revision 1.02 austriam systems ...

Page 10

... AS132 0 Data Sheet Package Drawings and Markings The AS1320 is available in a 6-pin SOT23 package. Figure 17. 6-pin SOT23 Package Notes: 1. All dimensions are in millimeters. 2. Foot length is measured at the intercept point between datum A and lead surface. 3. Package outline exclusive of mold flash and metal burr. ...

Page 11

... AS132 0 Data Sheet 10 Ordering Information The AS1320 is available as the standard products shown in Table 4. Ordering Information Part Marking AS1320-T ASD7 www.austriamicrosystems.com Table 4. Description 200mA Step-Up DC-DC Converter Revision 1.02 austriam systems Delivery Form Package Tape and Reel 6-pin SOT23 ...

Page 12

AS132 0 Data Sheet Copyrights Copyright © 1997-2006, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, stored, or used without the prior written consent ...

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